Apparatus for covering printing-rolls



-A. H. LEE. 1 v APPARATUS FOR COVERING PRINTING ROLLS.

APPLICATION FILED JULY l5, I918.

Patented Oct. 12, 1920.

UNITED STATES PATENT OFFICE.

ALBERT H. LEE, OF NEW YORK, N. Y., ASSIGNOR TO THE FUCHS 80 LANG MANUFAC- TUBING COMPANY, OF NEW YORK, N. Y. A CORPORATION OF NEW YORK.

Arrmmrus m COVERING mama-Rom.

Specification of Letters Patent.

Patented Oct. 12,1920.

Application filed Jul 15, 1918. Serial No. 245,052.

Toallwhomz'tmyconcem: V

'Be it known that I, ALBnRrH. LEE, a citizen of the United States, residing in'the borough of Bronx, county of Bronx, city and btate of New York, have invented certain new and useful Improvements in Apparatus for Covering I trinting-Rolls, of which the following is a specification.

My invention relates to an apparatus for drawing leather covers or skins over lithographic printing rolls and tightening 'or stretching the same thereon, and it more particularly relates to a means for applying and tightening the outer or leather covers of such rolls.

In practice lithographic rolls are usually surrounded by flannel andfelt covers and then by tight fitting seamless leather covers. Heretofore these outer covers were usually drawn on the rolls by hand. The hand operation being uneven and jerky produces creases and wrinkles both in the leather cover and in the nether fabric coverings of the rolls. Before the rolls could be used it was necessary to remove these creases and wrinkles so as to have an absolutely smooth surface for printing. The, method of putting on the covers by hand is exceedingly ditucult and tedious and requires'the services of three of four'men to make the cover sufficiently tight, whereas with my inven- 'tion' one man can do the work very easily.

It is an object of my invention to produce a means and method for drawing these covers over the lithographic rolls smoothly and quickly and so that no unevenri'esses are caused in the nether coverings of the roll or in the leather cover itself. I 7 My invention is alsoadapted to take up the slack or stretch that occurs in these leather covers after they'have been in use on the rolls for some time, as will be hereinafter described. My invention includes means for circumferentially gripping the outer or leather cover and drawing it over the roll. Other features of my invention and objects and advantages thereof will appear from the following particular description of means embodying my invention. I

I shall now describe the apparatus illustrated in the accompanying drawings and embodymg my invention, and shall thereafter point out my invention inclaims.

F lgure 1 1s a vertical sectional elevation of the apparatus showing it in the act of drawlng the 'cover on the roll. I

Fig. 2 1s an enlarged sectional elevation of the clamplng or gripping means for holding the cover in the drawing operation showlng th1s gripping means in locked or closed position; v

Fig. '3 is a plan view of this clamping or grlpplng means.

' Fig. 4 1s a cross section of the same taken on the line XX of Fig. 3.

Fig. 5 is a sectional elevation of the outer or pivotal ring of the clamping means.

F1gs. 6 and 7 are detail sectional elevatrons of the outer and innerclamping rings, respectively, of the clamping or gripping means. 7

Fig. is an elevation of a lithographic rollhaving the outer or leather cover in po-. sition and ready to be put into use. f

The apparatus for drawing covers over rolls illustrated in the drawings and embodying my invention consists of clamping or gripping means having an outer pivotal ring member 1 and clamping or gripping rings 2 and 3. The inner wall 4: of the clamping ring 3 is made straight and of a diameter slightly greater than that of the lithographic roll on which it is to be used.

The outer wall 5 of the ring 8'is of conical form and is provided with a flange 6 at the bottomthereof. The clamping ring 2 has a straight outer wall 7 and a conical inner wall 8. This conical inner wall 8 is adapted to fit over the conical outer wall 5 of the clamping ring 3. The outer wall 7 is provided with two abutments 9 directly opposite each other, and formin bearing faces for the clamping rings. he ring 1 has an inner wall 11 provided with two inwardly extending abutments 10 directly opposite each other which aline with the abutments or bearing faces 9 on the outer wall 7 of the ring 2. The ring 1 fits over and is adapted to pivot or turn on the ring 2. It is held in place by screw threaded pivot bolts 12 passing through the ring 1 and the abutments 9 and 10 and into the ring 2. The ring 1 is provided with two elongated proforming a handle 13 and the other forming open end 19 and foroedintothe ring 2, thus jections placed at right angles to the bearing faces of the abutments 9 and 10 one the fulcrum end 14 of a'lever formed by the ring 1 and these projections 13 and 14:..-

An extension 15 is provided .forthe handle 13 consisting of a piece of pipe or other suitable material. A toothed 'rack- 16-place'd against a wall or other suitable support is" provided. to be used ini'conj unction with the clamping member as hereinafter described.

In using my invention the operator'talies the usual outeror leather cover 17 having. one end 18. sewed up and the otherend 19 open, and draws theopenend 19 through the ring 2. The ring 3' isthen placed in the locking the end 19 of 'theleather cover between thesetwo rings The leather cover 17 having been secured, the clamping means are placed over the lithographic roll 20 having its nether coverings thereon as indicated bythe dotted lines at its outer edges.

The inner wall 1 of'the clamping ring?) fits smoothly and snugly .over the roll 20. The

roll 20 has projecting shafts 21 at each end;

The uncovered shaft 21 is placed in a socket 22 se'curedto the floor. V

The projecting fulcrum-end 14 of the ring..1 is ,now placed in one'of the upper.

notches of'the'rack 16 that is lower than the pivot-bolt 12, and the handle 15 is moved repeated again and again until the cover 17 is-completely drawn over the roll 20, The endl9 ,ofthe cover 17 is then released from the clamping rings'and sewed up as shown in Fig. 8 and the'roll is ready for use. The complete gripping of the entire end of'the leather. cover and the even downward movement of the clamping means over the roll 20 results in an avoidance of wrinkles and creases, both in the cover 17 andin the nether coverings of the'roll 20. V In practice after the roll has been in use iorsome time; this outer leather cover usuallystretches andit is necessary to take up the looseness or slack. Heretofore'this had to be done by handwith the same resultant eflects that were'had in originally drawing on the cover. With my invention, the strings or threads are withdrawn from the end of the cover and the end is gripped between the rings 2 and'3 and the-handle 15 is depressed" in the same manner as used in the original operation. The looseness is thus quickly and readily taken up'and the my invention;

end is resewn or tied and the roll is ready It is obvious that various modifications may be made in the construction shown in thedrawings' and above particularly described within the principle and scope of I claim: g e l Anapparatus' for drawing covers over printingl rolls comprising means for gripping oneend' of. the cover consisting of clamping rings adapted to fit around the roll, and meansfsecured to' such clamping rings for drawing the gripping means longitudinally ofthe rolls." I 2. An apparatusiordrawing covers over printing rolls comprising clamping rings for ,1 gripping one end of the'cover and a member pivoted to such clamping rings for forcing. such clamping rings over the roll.

' 3.: An apparatus forfdrawing covers over printing rolls comprising member adapted to fit over: the roll andfformingan inner clamping memberyan outerclamping member adapt'ed to cooperate with the inner clamping member to hold the cover between them,; and a member'pivoted" to the outer clamping 'member to draw the "cover over theroll.'- .m I

4;. An apparatus for drawing covers over printing rolls, comprising'an inner circular member fitting over the roll; a middle circular member fitting over the inner member, theseftwo' members forming clamping means for" gripping the end'of"tlie cover. and a circular member surrounding the middlecircular member and pivoted thereto for drawing the coverfover' the roll:

5; An apparatus"fondrawing covers over printingroll's comprising' an inner circular member fitting over the roll, a middle" cir cular member fitting over" the innerin'ember, these two members forming clamping means for gripping theend of the cover, and: a circular member surrounding' the middle circular memberand pivoted there-' to, thefpivotd} circular member having a handle at one side and a projecting member at" the oppositeside; V

6; An apparatusfor drawing coversover printing rolls comprising an inner circular member fitting over. the roll, a middle circular' member fitting over the inner member,jth ese two members forming clamping means for gripping the .end of the cover, a circular member surrounding themiddle circularmemberand pivoted thereto, the pivoted circular member having a handle at one side and a projecting" member at the opposite side, and atooth'edrackadapted to I engage the projecting member of the pivnected to the gripping means, and a fuloted circular member when the apparatus crum for the lever, whereby the power of is being used. the lever may be applied to draw the cover 10 7. An apparatus for drawing covers over over the roll; 5 printing rolls comprising means for grip- In testimony whereof I have aflixed'my ping one end of the cover and adapted to signaturevto this specification. fit around the roll, a lever operatively con- ALBERT H. LEE. 

